Energy storage power supply cabinet and on-grid and off-grid power supply systems comprising the same

Abstract

The invention discloses an energy storage power supply cabinet. The cabinet comprises: a storage battery set for storage and release of electric energy; an AC input wiring terminal, which is connected to an external AC power supply and is used for connection with the AC power supply; an energy storage bidirectional current transformer for charging or discharging the storage battery set; a control management system, which is connected to the storage battery set and the energy storage bidirectional current transformer and is used for monitoring charging and discharging status of the storage battery set and working status of the energy storage bidirectional current transformer and for monitoring and management of electric energy of the cabinet; and an AC output wiring terminal for connection with a load. The cabinet provided by an embodiment of the invention can work in an on-grid power supply system to ease the burden on a public power grid in a peak period of power use and ensure safe power use of users. The cabinet can also work in an off-grid power supply system to output high-quality stable electric power and ensure reliable and safe power supply. Besides, the cabinet can improve efficient usage of renewable energy. The invention further discloses an on-grid power supply system and an off-grid power supply system.

Description

technical field [0001] The invention relates to the technical field of energy utilization, in particular to an energy storage power supply cabinet and a grid-connected power supply system and an off-grid power supply system having the same. Background technique [0002] With the continuous development of the world economy, the sharp increase in human energy consumption, the scarcity to exhaustion of fossil fuels, and the deterioration of the ecological environment, energy and environmental issues have become increasingly prominent. Therefore, many countries have introduced renewable energy-related policies to vigorously support the development of renewable energy power generation. The "Twelfth Five-Year" development plan formulated by our country points out that it will focus on supporting the development of new energy industries. Solar energy and wind energy are the most direct renewable energy available to human beings, and they are also the most primitive energy obtained...

AI Technical Summary

Problems solved by technology

[0006] Advantages and disadvantages of grid-connected power supply: solar and wind power generation are connected to the same busbar as the public power grid, and supply power to the load at the same time. If the power generated by solar power and wind power exceeds the load power, the surplus power will be sent to the public power grid; if the power generated by solar power and wind power cannot meet the load power, public grid supplement

[0008] Advantages and disadvantages of off-grid power supply: the advantage is that it is not affected by the public power grid and operates in an island mode; the disadvantage is that there are many system design constraints and high matching requirements for each link

When affected by natural conditions or equipment failures, users will lose power supply. In addition, due to the remote location, equipment maintenance personnel cannot arrive at the scene in time, which may cause users to be in a power outage for a long time. have a greater impact on the lives of

Moreover, the population density in the above-mentioned areas is low, the number of households is small, and the electricity load is small, so the market prospect of energy storage technology products is not broad

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